Experience movies, games, and multi-channel music in high-resolution cinema sound. The compact, wall-mountable full-range surround speaker ES15 from Polk is Hi-Res Audio certified, compatible with Dolby Atmos and DTS:X, and features an acoustic array with Dynamic Balance, precision crossovers, and Power Port technology for stronger bass. The Hi-Res Audio certified Terylene dome tweeter of the ES15 delivers crystal-clear highs (40+ kHz) for high-resolution music from services like Apple Music, Tidal, Amazon Music HD, Qobuz, and Spotify HiFi, as well as the soundtracks of the latest Ultra HD movies. Polk's patented Power Port design provides more output and less distortion compared to traditional bass reflex speakers, thanks to its wider surface area and smoother airflow. Combined with the 5.25-inch woofer of the ES15, this results in effortless bass that tickles the belly. With an acoustic array featuring Dynamic Balance and phase-optimized precision crossovers, the Signature Elite ES15 ensures a seamless, realistic soundstage regardless of your listening position. The ES15 impresses with clear, room-filling, and realistic sound reproduction for virtually any amplifier or receiver—from classic 4 or 8-ohm audio systems to the latest surround sound AVRs with Dolby Atmos and DTS:X. - Front-firing drivers: 1-inch tweeter (round, diameter 2.54 cm) - Tweeter, 5.25 inches (13.34 cm) diameter (round) midrange - Mid/bass driver - Nominal impedance: Compatible with 8-ohm outputs - Total frequency response: 48 Hz → 40,000 Hz - Crossover frequency: 2500 Hz - Recommended amplifier power per channel: 20 Watts → 100 Watts - Max. sensitivity (1 Watt at 1 meter): 88 dB.